Abstract
This paper presents a new technique for realizing continuous 0°-360° RF signal phase shift over a very wide bandwidth. It is based on using single-sideband modulation together with optical filtering to largely suppress one of the RF modulation sidebands over a wide input RF frequency range, and controlling the phase of the optical carrier to shift an RF signal phase. The technique does not require expensive electrical or optical components to realize an RF signal phase shift over 2-40 GHz frequency range with a flat amplitude and phase response performance. This overcomes the current technology limitation in which no reported phase shifter structure has demonstrated the capability of operating in such a wide bandwidth. Experimental results demonstrate only ± 1 dB amplitude variation and ± 5° phase deviation from the desired RF signal phase shift over 2-40 GHz bandwidth and the RF signal amplitude control function. The phase shifter wavelength insensitive performance is also demonstrated experimentally.
Highlights
Microwave photonic technologies have been employed in designing electronics warfare systems [1]
This paper presents a new technique for realizing continuous 0°-360° RF signal phase shift over a very wide bandwidth
It is based on using single-sideband modulation to-gether with optical filtering to largely suppress one of the RF modulation sidebands over a wide input RF frequency range, and controlling the phase of the optical carrier to shift an RF signal phase
Summary
Microwave photonic technologies have been employed in designing electronics warfare systems [1]. Many microwave photonic techniques to realize an RF signal phase shift have been reported but very few of them have demonstrated broadband phase shifting operation [3,4,5,6,7]. Among these broadband phase shifters, none of them have the ability to realize flat amplitude and phase response over the 2–40 GHz frequency range, which is an operating frequency range for modern electronic warfare systems [8]. For example Pan et al demonstrated a wide bandwidth phase shifter based on a polarization rotation technique [4]. An ultra-sharp edge roll-off optical filter, e.g. a 1500 dB/nm edge roll-off optical filter from Alnair Labs, can be used to extend the phase shifter lower operating frequency but it is expensive, and most importantly both the optical filter and the laser source wavelengths need to be critically controlled, otherwise a small change in either one of these wavelengths will result in change in the output RF signal amplitude
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